what makes a computer run slow?

hi guyss, what would cause a computer to run slow? the computer is new, bought less than 3 months ago, runs windows 7, has sufficient ram (3 gigs) and a so so processor () i have defragged it, and cleaned the registry with advanced system care, i have also defragged the registry, using the same program. does anyone know what could of caused the speed to go down? for the first 2 weeks or so it was amazing, then it started to go down. is this in the computers hardware? or in the os? any help would be nice! thanks.

Always scan for potential malware, its the cause of many many slow PCs ^^Another thing, if you have, for example, 1 gig left of space on you 500 GB HDD it WILL be slow, it wont have anything to work with.

Also make sure your processor isnt too hot, it will slow down if it is and eventually break.

Theres A LOT of things that can slow down your PC, my first check is usually scanning my computer, cleaning my PC from all the "residual" files, etc..

Defragmenting should be done at least monthly, and scanning should be done at least once a week.Using disk cleanup often is also good, it will get rid of most of your unecessary files, not all but most of it.

I would also recommend using ad-aware to scan your PC for malware, i do hope you have an anti virus and a firewall allready installed.

(I know spartan mentioned the virus thing, but i didnt see until i was about to post it ^^)

well, its not my system but, i believe it does, i dont know if its a full fledged antivirus, but its called Norton internet security, and it does scan the computer itself, and it has a automatic defragmentation software on it. and what is ad aware, is it just a malware scanner, deleter thing ? and there is amply space on the drives(s)

Norton internet security is a full fledged anti virus and firewall, but i do suggest you scan it yourself from now on.

Ad-aware is a virus and spyware scanner so to speak(the free version) and i think its really good ^^go to lavasoft.com and get the free version and do a scan. You can also use other tools such as hijackthis and spybot S&D, but i think ad-aware should be enough for now.